Intense thunderstorms and swept across the Midwest Sunday, causing damage in several central Illinois communities while sending people to their basements for shelter and even prompting officials at Soldier Field in Chicago to evacuate the stands and delay the Bears game.

The community of Washington in central Illinois appeared particularly hard hit, and a state official said that emergency crews were racing to the area amid reports that people had been trapped in buildings. But communications were spotty — many calls made by to the area by The Associated Press could not be completed — and Patti Thompson of the Illinois Department of Emergency Management said it was difficult to get information from the scene.

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As the storm darkened downtown Chicago after noon, the Chicago Bears game was delayed and fans were ordered out of the stands and players led off the field.

Despite the reports of , there were not yet any confirmed reports of injuries.

"Our primary message is this is a dangerous weathers system that has the potential to be extremely deadly and destructive," said Laura Furgione, deputy director of the National Weather Service National Oceanic and Atmospheric Administration. "Get ready now."

Weather service officials confirmed that a touched down just before 11 a.m. near the central Illinois community of East Peoria, but authorities did not immediately have damage or injury reports. Within an hour, the weather service said that had touched down in Washington, Metamora, Morton and other central communities, though officials could not say whether it was one touching down or several. Weather officials said it was moving northeast about 60 mph; East Peoria is about 150 miles southwest of Chicago.

"This is a very dangerous situation," said Russell Schneider, director of the weather service's Storm Prediction Center. "Approximately 53 million in 10 states are at significant risk for thunderstorms and ."

Schneider noted that the storms are moving at 60 mph, which he said will not give people enough time to seek shelter if they're relying on watching the sky alone.

The potential severity of the storm this late in the season also carries the risk of surprise.

"People can fall into complacency because they don't see severe weather and , but we do stress that they should keep a vigilant eye on the weather and have a means to hear a warning because things can change very quickly," said Matt Friedlein, a weather service meteorologist.

According to agency officials, parts of Illinois, Indiana, southern Michigan and western Ohio are at the greatest risk of seeing , large hail and damaging winds throughout the day Sunday. Strong winds and atmospheric instability were expected to sweep across the central Plains during the day before pushing into the mid-Atlantic states and northeast by evening. Many of the storms were expected to become supercells, with the potential to produce , large hail and destructive winds.

In Chicago, the Office of Emergency Management and Communications issued a warning to fans attending making their way to Soldier Field to watch the Bears-Ravens game. It urged fans "to take extra precautions and ... appropriate measures to ensure their personal safety."

And in McHenry County, northwest of Chicago, funnel clouds were spotted late Sunday morning, dropping out of the clouds and then retreating again, said Bob Ellsworth, the assistant director of the county's emergency management agency. Ellsworth added that none had touched the ground or caused any damage.

Around the same time, the weather service issued a warning for parts of Kenosha, Racine and Walworth counties in Wisconsin.

Friedlein said that such strong storms are rare this late in the year because there usually isn't enough heat from the sun to sustain the thunderstorms. But he said temperatures Sunday are expected to reach into the 60s and 70s, which he said is warm enough to help produce severe weather when it is coupled with winds, which are typically stronger this time of year than in the summer.

"You don't need temperatures in the 80s and 90s to produce severe weather (because) the strong winds compensate for the lack of heating," he said. "That sets the stage for what we call wind shear, which may produce ."

He also said that the this time a year happen more often than people might realize, pointing to a twister that hit the Rockford, Ill., area in November 2010.